def main():
    N = int(input())
    abc = list(map(int, input().split()))
    a = abc[0]
    b = abc[1]
    c = abc[2]

    aa = []
    for x in range(1, N):
        hoge = a * x
        if hoge > N:
            break
        else:
            aa.append(hoge)

    bb = []
    for x in range(1, N):
        hoge = b * x
        if hoge > N:
            break
        else:
            bb.append(hoge)

    cc = []
    for x in range(1, N):
        hoge = c * x
        if hoge > N:
            break
        else:
            cc.append(hoge)

    aabbcc = aa + bb + cc
    aabbcc = list(set(aabbcc))
    print(len(aabbcc))


if __name__ == "__main__":
    main()